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Neighbours who witnessed the inferno say it was the largest blaze they'd ever seen.

"I've never, ever seen a fire that big and that hot in my life," Leanne Fitzgerald told Fairfax Radio.

"We were scared it was going to explode."

Ms Fitzgerald said she'd heard hissing - potentially coming from gas bottles on the back verandah - before the house was engulfed.

However, emergency workers say it's too early to rule on the cause of the fire, other than to say it does not appear suspicious.

"We'd like to thank the neighbours and the community who are rallying around the family and our thoughts go out to the family and friends of the people involved," Acting Inspector Stephen Newlands said.

From the street, the home appears a blackened shell and completely hollowed out by the blaze, while floral tributes have been placed in the front yard.